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Accumulation Characteristics of Protein and Non-Protein Components and Their Correlations with Protein Concentration in Rice Grains

Xiaoli Zhang1,2,#, Xiaohong Yin2,3,#, Jiana Chen3,#, Fangbo Cao3, Yu Liu3, Zhengwu Xiao3, Liqin Hu3, Guanghui Chen3, Tianfeng Liang1,2,*, Min Huang3,*

1 Rice Research Institute, Guangxi Academy of Agricultural Sciences, Nanning, 530007, China
2 Guangxi Key Laboratory of Rice Genetics and Breeding, Nanning, 530007, China
3 Crop and Environment Research Center for Human Health, College of Agronomy, Hunan Agricultural University, Changsha, 410128, China

* Corresponding Authors: Tianfeng Liang. Email: email; Min Huang. Email: email

Phyton-International Journal of Experimental Botany 2021, 90(4), 1285-1292. https://doi.org/10.32604/phyton.2021.014778

Abstract

Protein in rice grains is an important source of nutrition for rice consumers. This study mainly aimed to identify the critical factors that determine grain protein concentration in rice. Accumulation parameters, including mean accumulation rate (Rmean) and active accumulation duration (Dactive), for protein and non-protein components and their correlations with protein concentration in rice grains were investigated in field experiments conducted over two years with six rice cultivars. Results showed that grain protein concentration ranged from 9.6% to 11.9% across cultivars and years. Accumulation processes of protein and non-protein components were well fitted by the logistic equation for all six rice cultivars in both years, and the ratio of protein to non-protein for Rmean and Dactive ranged from 0.08 to 0.12 and 1.01 to 1.33, respectively. Grain protein concentration was significantly correlated with protein to non-protein ratio for Rmean. This study suggests that grain protein concentration is not solely determined by the accumulation of protein or non-protein component, but by the coordination of protein and non-protein accumulation.

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Zhang, X., Yin, X., Chen, J., Cao, F., Liu, Y. et al. (2021). Accumulation Characteristics of Protein and Non-Protein Components and Their Correlations with Protein Concentration in Rice Grains. Phyton-International Journal of Experimental Botany, 90(4), 1285–1292.



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